Abstract: According to the new characteristics of the smart substation automation system,a model for quantitatively evaluating the capacity effectiveness of the system in task fulfillment is proposed.The evaluation system composed of a physical network architecture,a logical network architecture,and the information flow,or thetwo networks one flowplatform for short is set up firstly.The effectiveness is defined as the total index which involves reliability,availability,real time and economy in the index system.Then,an analytic network process（ANP）model is developed to describe the complex relationships of influencing factors and calculate the network synthetic rank by the weighting,test and modulation of judgment matrixes.Finally,the stability of the ANP evaluation model and the credibility of scheme rank are tested by the ANP sensitivity analytical method to help evaluation decision-making.